Method of making piston rings



A. W. ALBRECHT.

METHOD OF MAKING PISTON RINGS.

APPUCATION FILED ocr. 20. ms.

1,415,620. Patent d M y9,1922.

- I K r 3 31 H A "1:: I

iv wbw i i v a v.

- pa rs ALBER w. ALBRECHT, or sun orri-s, MISSOURI; i

' METHOD OF MAKING PISTON" RINGS.

Specification of Letters Patent. I

"Patented May 9,1922:

T 0 all w ham it may concern Be it known that I, ALBERT ALBRECHT, a citizen of theUnited States, residing at the city of St. Louis and State of Missouri, have invented a new and useful Method of Making Piston Rings, 'of whichthe following is a specification.

This invention relates to a method of making piston rings.

An object of the invention is to provide an improved method for manufacture of piston rings from metal bars by rolling or otherwise forming the bars, in such shape that when the bar is rolled or formed in overlapping spirals, the ring wall will be of the same width all around.-

Another object of the invention is to provide a novel method of forming rings from a non-circular ring blank by rolhng the blanks into circular shape, having one or more spiral turns.

From the following detailed description of the method of manufacture, taken in connection with the accompanying drawing, my improvement may be clearly understood.

In the drawing,

Fig. 1 is a new of the metalbar from which the ring blanks are formed, before the same has been rolled or otherwise formed into the ring blank.

Fig. 2 is a View of the ring blank from which the ring is formed.

Fig. 3 is a side elevation of the ring.

Fig. 4: is an elevation of the finished ring, and

Fig. 5 is a view of the finished ring viewed from a point at right angles to the illustration in Fig. 4:-

The ring blanks are formed from the bar illustrated in Fig. 1, which bar is preferably rectangular in cross-section. The bar may be of any suitable metal.

The bar is first rolled into a metal strip or ring blank illustrated in Fig. 2. The bar may be cold rolled or rolled after heating; After the rolling process has been carried out, the ring blank will have an intermediate body portion 1, which is tapered in opposite directions forming the tapered end sections 2 and 3, terminating in knife edged extremities 4:, and 5, respectively.

After the ring blank has been formed, as shown in Fi 2, it is rolled into annular form, either in the cold state or under heat as desired. The finished ring comprises 'ters Patent is:

overlapping spirals, there being as many spiral turns as desired.

The line of taper in both directions from theintermediate body portion 1 is such that when thering-is rolled with itsfextremities at diametrically opposite points, the combined width of the spirals will be equal throughout the circumference 'of the ring.

In forming the ring from the ring blank,

the ring is so rolled that the adjacent edges of the spirals will be in close contact with each other throughout the circumference of the ring, .in order to close the gap and leave no space between the edges of the spirals.

It will be understood that the rings may be made of varying diameters, and that the finished rings will have a diameter equal tothe inner'diameter of the cylinder in which it is intended for use.

By accurately forming the ring blank and rolling it into annular-shape, no finishing or grinding operation is required.

From the foregoing, it will be observed that rings'may be made by the improved method hereln disclosed, very economically, and that the rings will be uniform throughout.

What I claim 1. The method of making a one-piece pis. ton ring, which consists in shaping a noncircular bar to form a rectilinear central and desireto secure by Letportion of equal width throughout its length, and tapering end portions narrower than the central portion throughout their length and each end portion being bordered on one side edge throughout its length by a rectilinear continuation of one of the side portion respectively, so that the completed ring will be of the same width throughout its circumference.

2. The method of making a one-piece piston ring, which consists in shaping a noncircular bar to form a central portion of' equal width throughout its length and to form tapering end portions each of which is bordered on one side edge throughout its length by a rectilinear continuation of one of the side edges of the central portion, and its opposite side edge being inclined from an intersection with said rectilinear continuation to an intersection with the opposite side edge of the central portion, and rolling said noncircular bar into annular form to place the inclined side edges thereof in contact with the side edges of the central portion so that the completed ring will be of the same width throughout its circumference.

3. The method of making a one-piece piston ring, which consists in shaping a noncircular bar to form a central portion of equal width throughout its length and to form tapering end portions each of which ing said non-circular bar into annular form with the inclined side edges toward each other and in contact with the side edges of the central portion so that the completed ring will be of the same width throughout its circumference.

ALBERT W. ALBRECHT. 

